4 Point manual bed traming

GeorgeM

I had to do some work on my bed. After I put it back together I am using this macro to adjust the 4 spring loaded corners:

G30 P0 X15 Y10 Z-99999 ; probe near an adjusting screw
G30 P1 X260 Y10 Z-99999 ; probe near an adjusting screw
G30 P2 X15 Y290 Z-99999 ; probe near an adjusting screw
G30 P3 X260 Y290 Z-99999 S4 ; probe near an adjusting screw

The results come up as the amount I need to turn each corner up / down, and also the number of turns to accomplish this. My question is what screw it that based off of and can it be changed to be accurate for an m4 .07 screw?

jay_s_uk

You should be using M671 to tell it where the 4 screws are located. The P value can then be used to tell it the pitch of the thread.
Make sure the order you probe matches the order in M671

GeorgeM

I have that, just didn't copy it:

m671 x10:280:10:280 y10:10:320:320 P0.5

G30 P0 X15 Y10 Z-99999 ; probe near an adjusting screw
G30 P1 X260 Y10 Z-99999 ; probe near an adjusting screw
G30 P2 X15 Y290 Z-99999 ; probe near an adjusting screw
G30 P3 X260 Y290 Z-99999 S4 ; probe near an adjusting screw

Phaedrux

P0.5 is for M3, You'd want P0.7 for M4 if that's the correct pitch.

https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M671_Define_positions_of_Z_leadscrews_or_bed_levelling_screws

GeorgeM

Thank you. Looked right past that.